WIR TX75 Specifications

Mid-range Infrared System

Dimensions, Weight:	10.0" W (25.4 cm) x 3.1" D (7.9 cm) x 1.5" H (3.8 cm) w/o faceplate or 2.5" H (6.4 cm) w/faceplate, 0.6 lbs (0.3kg)

Color:	Black with silver colored silk screen and silver colored faceplate
	Optional: white colored faceplate

Power Supply:	Desktop style international power supply with IEC line cord, 100-240 VAC input, 50-60Hz, 24W; 48VDC output

DC Power Input:	2.5mm ID barrel connector, 48 VDC, 0.4A center positive

Power Indicator:	Green LED

Sleep/Power Save Mode:	Shuts off carrier when no audio is present for 3 minutes

Modulation:	FM Wideband, ±50kHz deviation max, 50 μS pre-emphasis

Carrier Frequencies:	TX-75: 2.3MHz (Ch1) and 2.8MHz (Ch2).
	TX-75b: 3.3MHz (Ch1) and 3.8MHz (Ch2).
	Default at power on = carriers off. Carriers are automatically enabled upon presence of audio.

Emitter IR Power:	0.7 W

Master Only Coverage Area	5,000 sq. ft in single-channel mode with the RX22-4 receiver (464 sq. m)
(minimum, 1-Ch mode):	3,000 sq. ft in single-channel mode with the RX15-2 receiver (279 sq. m)
	2,000 sq. ft in single-channel mode with the RX18 receiver (186 sq. m)

Audio Inputs / Controls:	Line inputs: RCA jack for Ch1 and Ch2 accept line level, balanced or unbalanced audio
	Line in balanced/unbalanced switch: selects balanced or unbalanced line level audio for RCA jacks

Microphone input:	3.5 mm, stereo jack with signal and bias connected to tip, electret microphone compatible (4 VDC bias supply with 2.7k ohm
	series resistor)

Microphone gain adjust:	Rotary potentiometer

Microphone channel switch:	selects microphone input to Ch1 or Ch2

Audio indicators:	Yellow LED blinks at nominal audio level. One per channel

Indicators On/Off:	2-position switch turns on/off indicator lights

“to slave” Output/Input:	(2) 8p8c RJ45 connectors output 48VDC 0.4A power, baseband RF and a bi-directional RS-485 bus for control and status
	communications

Slave Status Indicators	Green: Power/Unit Status
(on “to slave” jacks):	Yellow: Transmit/Cable Status

Signal-to-Noise Ratio:	70 dB, (line input)

Frequency Response:	95Hz to 17.6kHz, -3dB re 1kHz (line inputs)
	125Hz to 17.0KHz, -3dB re 1kHz (microphone input)

Total Harmonic Distortion:	<1% (1 kHz, nominal deviation, line or microphone input)

Operating Requirements:	0-50° C (32°-122°F)

Mounting Kit:	Wall or Ceiling mount: BKT 024 Omnidirectional mount
	Optional: slave linking bar (MLB 003)

Warranty:	2 Years

CH 1 AUDIO

LEVEL INDICATOR

MIC

(YELLOW)

POWER

ADJUSTMENT

MIC IN

INDICATOR

SLAVE TRANSMIT POWER INDICATOR (YELLOW)

CH 2 AUDIO

LEVEL INDICATOR

(YELLOW)

SLAVE POWER INDICATOR (GREEN)

INDICATOR

LIGHTS (ON/OFF)

POWER IN MIC CHANNEL
	RCA IN RCA IN
SELECTOR	(2.3) TX-75 (2.8)

	(3.3) TX-75b (3.8)

TX75 BUS	TX75 BUS
OUT TO	OUT TO
SLAVE (1)	SLAVE (2)

LINE IN BALANCED/
UNBALANCED SELECTOR	A139